for (int i = 0; i < 160; i++){ strip.setPixelColor(i, 0, 0,0); strip.show(); }This example will turn all LEDS to 0 (off). You could have the .show after the loop but its so fast it doesnt matter in this case.

Again, just play around with some of the basic effects and see what happens. Easiest way to start to understand how the arduino code works.